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Laminar–turbulent coexistence in annular Couette flow

Published online by Cambridge University Press:  01 October 2019

Kohei Kunii
Affiliation:
Department of Mechanical Engineering, Tokyo University of Science, Chiba 278-8510, Japan
Takahiro Ishida
Affiliation:
Department of Mechanical Engineering, Tokyo University of Science, Chiba 278-8510, Japan
Yohann Duguet
Affiliation:
LIMSI-CNRS, Université Paris-Sud, Université Paris-Saclay, F-91405 Orsay, France
Takahiro Tsukahara*
Affiliation:
Department of Mechanical Engineering, Tokyo University of Science, Chiba 278-8510, Japan
*
Email address for correspondence: [email protected]

Abstract

Annular Couette flow is the flow between two coaxial cylinders driven by the axial translation of the inner cylinder. It is investigated using direct numerical simulation in long domains, with an emphasis on the laminar–turbulent coexistence regime found for marginally low values of the Reynolds number. Three distinct flow regimes are demonstrated as the radius ratio $\unicode[STIX]{x1D702}$ is decreased from 0.8 to 0.5 and finally to 0.1. The high-$\unicode[STIX]{x1D702}$ regime features helically shaped turbulent patches coexisting with laminar flow, as in planar shear flows. The moderate-$\unicode[STIX]{x1D702}$ regime does not feature any marked laminar–turbulent coexistence. In an effort to discard confinement effects, proper patterning is, however, recovered by artificially extending the azimuthal span beyond $2\unicode[STIX]{x03C0}$. Eventually, the low-$\unicode[STIX]{x1D702}$ regime features localised turbulent structures different from the puffs commonly encountered in transitional pipe flow. In this new coexistence regime, turbulent fluctuations are surprisingly short-ranged. Implications are discussed in terms of phase transition and critical scaling.

Type
JFM Papers
Copyright
© 2019 Cambridge University Press 

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Footnotes

Present address: Japan Aerospace Exploration Agency, Tokyo 182-8522, Japan.

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Kunii et al. supplementary movie

Time evolution of fluctuating velocity fields viewed at mid-gap (top) and on a cross section (bottom three panels), for η = 0.1, Lθ= 16π, and Re = 275, where the new flow regime has been observed. From top to bottom, contours show x-z (or x-θ) distribution of ur', and r-θ views of the streamwise ux', radial ur', and azimuthal components uθ', at the same time. The time span visualized here is 800 time units (h/uw).

Download Kunii et al. supplementary movie(Video)
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